Abstract
Correlation sonar systems, such as correlation velocity logs and synthetic aperture sonar micronavigation, can estimate platform motion using measurements of the spatial coherence of seafloor scattering. During the course of operation, the spatial coherence measurements made by these systems will fluctuate about their average values. A variety of factors, including noise sources, changing environmental properties, and statistical estimation error can all contribute to the variability in these measurements. This presentation will introduce models that can be used to predict the variability in measurements of spatial coherence. These models will be compared with field measurements of spatial coherence collected at normal incidence to the bottom of Seneca Lake. Finally, the application of these models will be discussed as they relate to the design of arrays and signal processing algorithms for correlation sonar systems. (The authors want to acknowledge the financial support for this work by Lockheed Martin Rotary and Mission Systems.)Correlation sonar systems, such as correlation velocity logs and synthetic aperture sonar micronavigation, can estimate platform motion using measurements of the spatial coherence of seafloor scattering. During the course of operation, the spatial coherence measurements made by these systems will fluctuate about their average values. A variety of factors, including noise sources, changing environmental properties, and statistical estimation error can all contribute to the variability in these measurements. This presentation will introduce models that can be used to predict the variability in measurements of spatial coherence. These models will be compared with field measurements of spatial coherence collected at normal incidence to the bottom of Seneca Lake. Finally, the application of these models will be discussed as they relate to the design of arrays and signal processing algorithms for correlation sonar systems. (The authors want to acknowledge the financial support for this work by Lockheed Martin R...
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